2. Linac4 RF System Operation for the Reliability Run in 2017
Suitbert Ramberger, CERN, BE-RF-LRF
Reporting also for Andy Butterworth, Philippe Baudrenghien, Olivier Brunner

3. Introduction Linac4 RF systems RF deployment until the Reliability Run
RF deployment from the Reliability Run
Linac4 RF Organization
System Level Debugging
Linac Operation (as seen from RF side)
Linac Operation Issues

4. Linac4 RF Systems 3 Buncher, 1 Chopper
1 RFQ, 3 DTL, 7 CCDTL, 12 PIMS, 1 Debuncher
3 Buncher, 1 Debuncher Solid-State Power-Amplifier
17 Klystrons (9 LEP type, 8 new)
Mechanical Tuners, RFQ Water Temperature Tuning
Phase Shifters, Control Systems, EIS RF Interlock
Low-Level RF Systems, Control Software

5. RF Deployment until RR Installation of debuncher cavity
Conformance work on debuncher amplifier
Water circuit verifications on DTL
Pick-up replacement on DTL T2/T3 center probes
Power coupler tuning on DTL
Intervention on air cooling on CPI klystron PIMS03/04
Adjustment of line length on one PIMS branch
(phase shifter setting is at its limit)

6. RF Deployment until RR contd.
Upgrade of tuner control (asap)
Additional tuner control modules for 6 PIMS cavities
Upgrade of cavity loop cards v0/v1 to v3 on 5 systems
Chopper Drive Unit hardware / FESA completion
Chopper Trigger Unit cards v2 FESA completion
FESA implementation of RF ON sequence
TIMBER data logging beyond DTL3
DIAMON process monitor debugging
RF Expert Inspector tools debugging / improvement

7. RF Deployment from RR
Commissioning of the debuncher system (1st month)
Commissioning of cavity loops v3 (1st month)
Commissioning of the beam loading compensation: Kalmann Predictor and Adaptive Feed-forward (AFF)
Automatic Reconditioning
Monitoring, Testing, Debugging
Work requires regular Technical Stops

8. Linac4 RF Organization Combined Effort of 4 Sections in the RF Group
Modulators and Klystrons (MK)
Feedbacks & Beam Control (FB)
Servos & Controls Interface (CS)
Linacs RF (LRF)
Tight dependence also on the Modulator (TE-EPC)
Some Interlocks are linked to specific service in charge
Some require intervention and further analysis:
E.g. excess in reflected power on the klystron

9. System Level Debugging

10. Linac Operations (tbd)
Operation from CCC by Operator
In case of problems -> Calls Linac Supervisor
Analyses Issue, dispatch to RF first line (BE-LRF)
Analyses faulty RF system, dispatch to RF Experts
Daytime Service through Linac RF 76645
Best Effort Call-Out List during Daytime on Weekends
Intervention by RF Experts during working hours
RR is a unique opportunity to train future piquets

11. Linac Operation Issues
Current RF applications are first line / expert tools
They are not meant for operators or supervisors
They are not sufficient for reliable operation
Operation with 2 days MD, 2 weeks operation (or 3/3)
Primary goals for reliability run:
Make sure that systems are fully compliant
Find reliability issues
Debug, debug, debug